/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.mpp.aggregation.timerangeiterator;

import static org.apache.iotdb.db.utils.DateTimeUtils.MS_TO_MONTH;

public class TimeRangeIteratorFactory {

    private TimeRangeIteratorFactory() {
    }

    /**
     * The method returns different implements of ITimeRangeIterator depending on the parameters.
     *
     * <p>Note: interval and slidingStep is always stand for the milliseconds in this method.
     */
    public static ITimeRangeIterator getTimeRangeIterator(
            long startTime,
            long endTime,
            long interval,
            long slidingStep,
            boolean isAscending,
            boolean isIntervalByMonth,
            boolean isSlidingStepByMonth,
            boolean leftCRightO,
            boolean outputPartialTimeWindow) {
        long originInterval = interval;
        long originSlidingStep = slidingStep;
        interval = isIntervalByMonth ? interval / MS_TO_MONTH : interval;
        slidingStep = isSlidingStepByMonth ? slidingStep / MS_TO_MONTH : slidingStep;

        if (outputPartialTimeWindow && originInterval > originSlidingStep) {
            if (!isIntervalByMonth && !isSlidingStepByMonth) {
                return new PreAggrWindowIterator(
                        startTime, endTime, interval, slidingStep, isAscending, leftCRightO);
            } else {
                return new PreAggrWindowWithNaturalMonthIterator(
                        startTime,
                        endTime,
                        interval,
                        slidingStep,
                        isAscending,
                        isSlidingStepByMonth,
                        isIntervalByMonth,
                        leftCRightO);
            }
        } else {
            return new AggrWindowIterator(
                    startTime,
                    endTime,
                    interval,
                    slidingStep,
                    isAscending,
                    isSlidingStepByMonth,
                    isIntervalByMonth,
                    leftCRightO);
        }
    }
}
